MALE-FEMALE INTERACTION THROUGHOUT THE ESTROUS-CYCLE OF THE SYRIAN-HAMSTER (MESOCRICETUS-AURATUS)

Interactions between male and female hamsters over the oestrous cycle were measured in terms of proximity. Independent variations in approaching and leaving by the female were found over the four-day period. Changes in female behaviour, which could be related to known changes in her hormonal state, resulted in changes in the male-female interaction not only at oestrous but also within the three dioestrous days of the cycle. These changes were in the amount of time the animals spent together or apart; this in turn was affected by which sex initiated the approaches and leaves. During oestrus proximity measures correlated well with latency to first lordosis which is a sensitive measure of degree of receptivity. Proximity measures provide a detailed description of the male-female interaction and should prove useful in studying the effects of experimental alteration of previous experience and hormonal state. © 1979.